;== Initialize DustemWrap
dustem_init

;== set DustemWrap behavior
!dustem_verbose=1
!dustem_show_plot=1

;== Read an SED
dir=!dustem_wrap_soft_dir+'/Data/SEDs/'
file=dir+'Gal_composite_spectrum.xcat'
spec=read_xcat(file,/silent)
;=== SET THE OBSERVATION STRUCTURE
dustem_set_data,spec

;== define which model parameters to vary
;=== pd is the parameter definition
pd=[$
  '(*!dustem_params).G0', $                   ;G0 radiation field intensity
  '(*!dustem_params).grains(1).mdust_o_mh',$  ;PAH1 mass fraction
  '(*!dustem_params).grains(0).mdust_o_mh',$  ;PAH0 mass fraction
  '(*!dustem_params).grains(2).mdust_o_mh',$  ;amCBEx mass fraction
  '(*!dustem_params).grains(3).mdust_o_mh',$  ;amCBEx mass fraction
  '(*!dustem_params).grains(4).mdust_o_mh',$  ;aSil mass fraction
  'dustem_create_continuum_2']                ;Intensity of NIR continuum
Npar=n_elements(pd)
;=== iv gives the corresponding initial values
iv =   [1.0, 7.8e-4, 7.8e-4,1.65e-4,1.45e-3,7.8e-3,0.001]
;=== The following indicate if the parameters are upper or lower limited
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
;=== The following gives corresponding lower limits
llims=replicate(0.,Npar)

;== SET THE FITTED PARAMETERS
dustem_init_parinfo,pd,iv,up_limited=ulimed, $
                    lo_limited=llimed,up_limits=ulims,lo_limits=llims

;== Run the SED fitting
tol=1.e-14   ;Tolerance used
Nitermax=3   ;maximum number of iteration
             ;This is the criterium which will stop the fit procedure

loadct,13
;This is to ajust plot range
!y.range=[1e-4,10]
res=dustem_mpfit_sed(tol=tol,Nitermax=Nitermax)

;=== Plot best fit
yr=[1e-4,10] & xr=[1,2000]
tit='DUSTEM Example'
ytit=textoidl('I_\nu (MJy/sr) for N_H=10^{20} H/cm^2')
xtit=textoidl('\lambda (\mum)')
errors=(*(*!dustem_fit).current_param_errors)*(*(*!dustem_fit).param_init_values)
chi2=(*!dustem_fit).chi2
rchi2=(*!dustem_fit).rchi2

loadct,13
dustem_sed_plot,(*(*!dustem_fit).current_param_values), $
                ytit=ytit,xtit=xtit,title=tit,yr=yr,xr=xr,/ysty,/xsty, $
                res=res,errors=errors,chi2=chi2,rchi2=rchi2